Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.

CDF Collaboration

doi:10.1103/PhysRevD.98.072002

Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.

CDF Collaboration

Department of Physics

University of Helsinki
National Institute for Nuclear Physics
University of Padua
University of Michigan, Ann Arbor
Fermi National Accelerator Laboratory
Northwestern University
Comenius University
Waseda University
Joint Institute for Nuclear Research
Texas A&M University
Argonne National Laboratory
University of Oxford
Kyungpook National University
Lawrence Berkeley National Laboratory
Purdue University
Johns Hopkins University
University of Siena
University of Pisa
University of Wisconsin-Madison
Duke University
Rockefeller University
Baylor University
University of Rochester
University of Pittsburgh
The University of Chicago
University of Bologna
Michigan State University
University of Glasgow
Carnegie Mellon University
Autonomous University of Barcelona

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Abstract

The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.

Original language	English
Article number	072002
Journal	Physical Review D
Volume	98
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.98.072002
State	Published - 1 Oct 2018

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10.1103/PhysRevD.98.072002

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@article{2f9388bf46fb4403be51caf817df68a8,

title = "Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.",

abstract = "The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (p{\=p}) collisions with a vertex displaced from the p{\=p} interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into b{\=b}. The number of Z→b{\=b} events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(p{\=p}→Z)×B(Z→b{\=b})=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive p{\=p}→H→b{\=b} process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95\% confidence level.",

author = "\{CDF Collaboration\} and T. Aaltonen and S. Amerio and D. Amidei and A. Anastassov and A. Annovi and J. Antos and G. Apollinari and Appel, \{J. A.\} and T. Arisawa and A. Artikov and J. Asaadi and W. Ashmanskas and B. Auerbach and A. Aurisano and F. Azfar and W. Badgett and T. Bae and A. Barbaro-Galtieri and Barnes, \{V. E.\} and Barnett, \{B. A.\} and P. Barria and P. Bartos and M. Bauce and F. Bedeschi and S. Behari and G. Bellettini and J. Bellinger and D. Benjamin and A. Beretvas and A. Bhatti and Bland, \{K. R.\} and B. Blumenfeld and A. Bocci and A. Bodek and D. Bortoletto and J. Boudreau and A. Boveia and L. Brigliadori and C. Bromberg and E. Brucken and J. Budagov and Budd, \{H. S.\} and K. Burkett and G. Busetto and P. Bussey and P. Butti and A. Buzatu and A. Calamba and S. Camarda and Moon, \{C. S.\}",

note = "Publisher Copyright: {\textcopyright} 2018 authors. Published by the American Physical Society.",

year = "2018",

month = oct,

day = "1",

doi = "10.1103/PhysRevD.98.072002",

language = "English",

volume = "98",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "7",

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TY - JOUR

T1 - Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.

AU - CDF Collaboration

AU - Aaltonen, T.

AU - Amerio, S.

AU - Amidei, D.

AU - Anastassov, A.

AU - Annovi, A.

AU - Antos, J.

AU - Apollinari, G.

AU - Appel, J. A.

AU - Arisawa, T.

AU - Artikov, A.

AU - Asaadi, J.

AU - Ashmanskas, W.

AU - Auerbach, B.

AU - Aurisano, A.

AU - Azfar, F.

AU - Badgett, W.

AU - Bae, T.

AU - Barbaro-Galtieri, A.

AU - Barnes, V. E.

AU - Barnett, B. A.

AU - Barria, P.

AU - Bartos, P.

AU - Bauce, M.

AU - Bedeschi, F.

AU - Behari, S.

AU - Bellettini, G.

AU - Bellinger, J.

AU - Benjamin, D.

AU - Beretvas, A.

AU - Bhatti, A.

AU - Bland, K. R.

AU - Blumenfeld, B.

AU - Bocci, A.

AU - Bodek, A.

AU - Bortoletto, D.

AU - Boudreau, J.

AU - Boveia, A.

AU - Brigliadori, L.

AU - Bromberg, C.

AU - Brucken, E.

AU - Budagov, J.

AU - Budd, H. S.

AU - Burkett, K.

AU - Busetto, G.

AU - Bussey, P.

AU - Butti, P.

AU - Buzatu, A.

AU - Calamba, A.

AU - Camarda, S.

AU - Moon, C. S.

PY - 2018/10/1

Y1 - 2018/10/1

N2 - The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.

AB - The Collider Detector at Fermilab collected a unique sample of jets originating from bottom-quark fragmentation (b-jets) by selecting online proton-antiproton (pp̄) collisions with a vertex displaced from the pp̄ interaction point, consistent with the decay of a bottom-quark hadron. This data set, collected at a center-of-mass energy of 1.96 TeV, and corresponding to an integrated luminosity of 5.4 fb-1, is used to measure the Z-boson production cross section times branching ratio into bb̄. The number of Z→bb̄ events is determined by fitting the dijet-mass distribution, while constraining the dominant b-jet background, originating from QCD multijet events, with data. The result, σ(pp̄→Z)×B(Z→bb̄)=1.11±0.08(stat)±0.14(syst) nb, is the most precise measurement of this process, and is consistent with the standard-model prediction. The data set is also used to search for Higgs-boson production. No significant signal is expected in our data and the first upper limit on the cross section for the inclusive pp̄→H→bb̄ process at s=1.96 TeV is set, corresponding to 33 times the expected standard-model cross section, or σ=40.6 pb, at the 95% confidence level.

UR - https://www.scopus.com/pages/publications/85056190367

U2 - 10.1103/PhysRevD.98.072002

DO - 10.1103/PhysRevD.98.072002

M3 - Article

AN - SCOPUS:85056190367

SN - 2470-0010

VL - 98

JO - Physical Review D

JF - Physical Review D

IS - 7

M1 - 072002

ER -

Search for standard-model Z and Higgs bosons decaying into a bottom-antibottom quark pair in proton-antiproton collisions at 1.96 TeV SEARCH for STANDARD-MODEL Z and HIGGS ... T. AALTONEN et al.

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